IPA: /ˌæd.əˈlɛs.ənt.li/
KK: /ˌæd.əˈles.ənt.li/
In a way that is typical of a teenager, often relating to the behaviors, attitudes, or emotions associated with adolescence.
She approached the situation adolescently, showing a lack of maturity.
Adolescently → It is formed from "adolescens" (from Latin, meaning growing up or maturing) and the suffix "-ly" (meaning in a manner of). The word "adolescently" refers to behaving or acting in a manner characteristic of a young person who is growing up.
Think of 'growing up' ('adolescens') to remember that 'adolescently' means acting in a way typical of someone who is maturing.